EP3763651B1 - Method for feeding a plurality of yarns under controlled tension to a textile machine - Google Patents

Method for feeding a plurality of yarns under controlled tension to a textile machine Download PDF

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Publication number
EP3763651B1
EP3763651B1 EP20180925.8A EP20180925A EP3763651B1 EP 3763651 B1 EP3763651 B1 EP 3763651B1 EP 20180925 A EP20180925 A EP 20180925A EP 3763651 B1 EP3763651 B1 EP 3763651B1
Authority
EP
European Patent Office
Prior art keywords
feeders
tension
yarn
operating
row
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20180925.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3763651A1 (en
Inventor
Luca Gotti
Giovanni Pedrini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LGL Electronics SpA
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LGL Electronics SpA
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Publication date
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP3763651A1 publication Critical patent/EP3763651A1/en
Application granted granted Critical
Publication of EP3763651B1 publication Critical patent/EP3763651B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • B65H59/388—Regulating forwarding speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • B65H59/385—Regulating winding speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/30—Devices controlling the forwarding speed to synchronise with supply, treatment, or take-up apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/60—Details of processes or procedures
    • B65H2557/63—Optimisation, self-adjustment, self-learning processes or procedures, e.g. during start-up
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/50—Diminishing, minimizing or reducing
    • B65H2601/52—Diminishing, minimizing or reducing entities relating to handling machine
    • B65H2601/525—Cost of application or use, e.g. energy, consumable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a method for feeding a plurality of yarns under controlled tension to a textile machine.
  • multiple yarns can be fed to a textile machine by way of respective yarn feeders, for example feeders of the "positive" type.
  • This type of feeder is provided with a motorized reel, on which the yarn is wound repeatedly (e.g., 3 or 4 windings). When the reel is rotated, the yarn is unwound from a spool and is fed to a textile machine downstream.
  • the yarn tension in output from the feeder is monitored continuously by a tension sensor, which can be integrated in the feeder.
  • a control unit which is also optionally integrated in the feeder, modulates the speed of the reel on the basis of the signal received from the tension sensor, so as to stabilize the tension of the yarn fed to the textile machine at a level that can be set by the user, to the advantage of the quality of the garment.
  • the yarns can be arranged very close to each other at the point where they enter the machine. Therefore, there is insufficient space to arrange all the feeders next to each other, if they have an integrated tension sensor.
  • the feeders must be positioned at a certain distance from the warping machine, and they may need to use the signal generated by an external tension sensor which is preferably positioned immediately upstream of the warping machine.
  • EP 1901984 B1 discloses a system of this type, in which two tension sensors are used for each yarn, one of which is arranged at the exit of the feeder and can be integrated in it, while the other is arranged at the entry of the textile machine.
  • the control unit based on an adapted algorithm, controls the feeder by taking account of the tension values measured by both sensors, so as to limit the risk of instabilities arising.
  • a drawback of the system described in EP 1901984 B1 is its high cost, in that it envisages using two tension sensors for each yarn.
  • EP 2573027 A1 discloses a method for feeding a plurality of yarns, including a calibration procedure in which all the feeders are used to define a correction factor.
  • the aim of the present invention is to provide a method for feeding a plurality of yarns under controlled tension to a textile machine, which makes it possible to precisely control the tension while considerably reducing the number of tension sensors compared to conventional solutions, like the one described in EP 1901984 B1 , and improving the calibration procedure, like the one described in EP 2573027 A1 .
  • Figure 1 is a schematic illustration of an apparatus for feeding yarn under controlled tension using the method according to the invention.
  • a yarn feeding apparatus 10 comprises a plurality of feeders F1,1, F1,2 ..., FY,X.
  • the yarn tension in output from the feeder is monitored continuously by a tension sensor S1,1, SI,2 ..., SY,X which is arranged immediately downstream of the feeder, and optionally incorporated in the feeder itself.
  • the tension sensor is connected to a control unit (not shown), which modulates an adjustment parameter of the feeder on the basis of the signal received from the respective tension sensor, so as to maintain the tension of the yarn fed to the textile machine substantially constant at a level that can be configured by the user, which henceforth is referred to as the operating tension.
  • the feeders F1,1, F1,2 ..., FY,X are all of the "positive" type.
  • a positive feeder is provided with a motorized reel W1,1, W1,2 ..., WY,X on which a yarn H1,1, H1,2 ..., HY,X is wound repeatedly (e.g., 3 or 4 windings).
  • the yarn is unwound from a spool R1,1, R1,2 ..., RY,X and is fed to a textile machine downstream, e.g., a warping machine M (shown only schematically in Figure 1 ).
  • the adjustment parameter modulated by the control unit is the rotation speed of the reel W1,1, W1,2 ..., WY,X.
  • the rotation speed in fact determines the feeding speed of the yarn and, as a consequence, the operating tension by difference with respect to the speed with which the yarn is taken up by the downstream machine.
  • the feeders F1,1, F1,2 ..., FY,X and the respective spools R1,1, R1,2 ..., RY,X are located on a number Y of rows L1, L2, ..., LY, typically substantially horizontal rows which are arranged at different heights. Each row comprises a number X of feeders which are arranged at progressively increasing distances from the warping machine M.
  • each row L1, L2, ..., LY are uniquely identified by a first subscript which varies from 1 to Y, which identifies the number of the row from the topmost row to the bottommost row, and a second subscript which varies from 1 to X, which identifies the position of the element in the row, from the element closest to the warping machine M to the element furthest away, so as to provide a matrix.
  • the real tension of the yarn H1,1 will be higher than the operating tension but lower than the real tension of the yarn HI,2, which in turn will be lower than the real tension of the yarn HI,3, and so on up until the yarn H1,X.
  • the feeders F1,1, F1,2 ..., FY,X are preliminarily subjected to a calibration procedure to calibrate the respective operating tensions, which comprises the following steps:
  • all the feeders F1,1, F1,2 ..., FY,X, and not just the two reference feeders Fa, Fb can be preliminarily set to the desired tension.
  • the positions a and b correspond to the two extreme positions of the row, that is to say, positions 1 and X, so as to minimize error in the construction of the mathematical function.
  • the operating tensions on the feeders of a preselected reference row are adjusted, the same values are set on the feeders of one or more of the other rows, e.g., the two or three closest rows, or on all the other rows.
  • one of the intermediate rows is used as a reference row.
  • the operating tensions are calibrated on intermediate values.
  • the method is repeated on all the rows.
  • the number of tension sensors to be arranged at the entry to the warping machine M will be equal to 2 ⁇ Y.
  • the operating tension values set on the feeders of one row are applied on the feeders of one or more of the other rows using a "scaling factor", on the basis of a preset function that takes account of the differences that are normally present between different rows.
  • the method according to the invention could likewise be applied to accumulator feeders, i.e., feeders in which the yarn is wound on a drum so as to form a stock, and is unwound when needed by the downstream machine.
  • the control unit adjusts the braking intensity applied by braking means which act by friction on the yarn at the exit of the drum, on the basis of to the signal received from a tension sensor, so as to maintain the tension of the yarn fed, i.e. the operating tension, substantially constant at the level set by the user.
  • the adjustment parameter is the braking intensity applied to the brake.
  • the mathematical function on which the calibration is based can be other than a simple linear function, e.g., if the feeders are not all equally spaced apart or, empirically, it is found that the operating tension necessary in order to have the desired tension immediately upstream of the machine does not increase linearly with the distance.
  • a different mathematical function can be applied, or a function built empirically and leveled off in each instance on the operating tensions TLa and TLb that are programmed at the positions a and b on the basis of the values of the respective measured real tensions TRa and TRb.
  • the construction of such function can be based on measurements of the real tension made on a greater number of yarns, e.g., the two end positions plus one or two intermediate positions in the row, by adding sensors.
  • the rows do not necessarily all have to have the same number of feeders.

Landscapes

  • Tension Adjustment In Filamentary Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Knitting Machines (AREA)
EP20180925.8A 2019-07-11 2020-06-18 Method for feeding a plurality of yarns under controlled tension to a textile machine Active EP3763651B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000011451A IT201900011451A1 (it) 2019-07-11 2019-07-11 Metodo per l'alimentazione a tensione controllata di una pluralita' di filati ad una macchina tessile

Publications (2)

Publication Number Publication Date
EP3763651A1 EP3763651A1 (en) 2021-01-13
EP3763651B1 true EP3763651B1 (en) 2021-10-27

Family

ID=68582145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20180925.8A Active EP3763651B1 (en) 2019-07-11 2020-06-18 Method for feeding a plurality of yarns under controlled tension to a textile machine

Country Status (4)

Country Link
EP (1) EP3763651B1 (it)
CN (1) CN112209179B (it)
ES (1) ES2902632T3 (it)
IT (1) IT201900011451A1 (it)

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1303022B1 (it) * 1998-04-17 2000-10-20 Btsr Int Spa Dispositivo di controllo dell'alimentazione del filato ad una macchinatessile e metodo di controllo del funzionamento e produzione di
EP1319622A1 (de) * 2001-12-05 2003-06-18 Schärer Schweiter Mettler AG Verfahren und Vorrichtung zur Regelung der Fadenspannung auf einer Textilmaschine sowie Anwendung des Verfahrens
ITMI20020770A1 (it) * 2002-04-10 2003-10-10 Tiziano Barea Dispositivo e metodo per alimentare un filo elastomerico ad una macchina tessile al fine di avere un manufatto di qualita' costante in ogni
ITMI20051325A1 (it) * 2005-07-12 2007-01-13 Btsr Int Spa Metodo e dispositivo per assicurare l'alimentazione di un filo a tensione costante a doppio anello di regolazione ad una macchina tessile
ITMI20072269A1 (it) * 2007-12-04 2009-06-05 Btsr Int Spa Metodo e disposizione per l'alimentazione a lunghezza di filo costante assorbito di una macchina tessile operante su una pluralita' di fili
EP2080724B1 (en) * 2008-01-17 2013-01-30 BTSR International S.P.A. System for controlling the feed of a yarn or wire to a machine, and relative method
ITMI20100887A1 (it) * 2010-05-18 2011-11-19 Btsr Int Spa Metodo e dispositivo perfezionato per alimentare un filo ad una macchina operatrice con tensione e velocita' costante
ITMI20111027A1 (it) * 2011-06-08 2012-12-09 Btsr Int Spa Metodo e dispositivo per alimentare a tensione e velocita' o quantita' costante un filo ad una macchina tessile
ITTO20110840A1 (it) * 2011-09-20 2013-03-21 Lgl Electronics Spa Metodo di taratura di alimentatori di filato a tensione controllata su linee di tessitura.
ITTO20120261A1 (it) * 2012-03-22 2013-09-23 Lgl Electronics Spa Metodo di alimentazione/recupero del filato per macchine tessili, ed apparato per l'esecuzione di tale metodo.
ITMI20120734A1 (it) * 2012-05-03 2013-11-04 Btsr Int Spa Metodo e dispositivo di avvolgimento di un filo sintetico proveniente da un estrusore
ITTO20130017A1 (it) * 2013-01-10 2014-07-11 Lgl Electronics Spa Gruppo di alimentazione di filato per macchine tessili.
EP3137664B1 (en) * 2014-06-13 2018-04-18 Memminger-IRO GmbH Method to control feeding a yarn and yarn feeder

Also Published As

Publication number Publication date
ES2902632T3 (es) 2022-03-29
IT201900011451A1 (it) 2021-01-11
EP3763651A1 (en) 2021-01-13
CN112209179B (zh) 2023-08-22
CN112209179A (zh) 2021-01-12

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